updated dependencies & fix vulnerabilities

[timea-solid]

• updated eslint from version 8 to 9 -> migration of config file (see: https://eslint.org/docs/latest/use/configure/migration-guide)
• updated jest from 29.x to 30.x
• updated babel plugins

[Copilot]

Pull Request Overview

This PR updates dependencies to fix vulnerabilities and migrate to newer versions: ESLint v8 → v9, Jest v29 → v30, and updated Babel plugins. The migration includes adopting the new ESLint flat config format and addressing TypeScript linting issues that arose from the updated rules.

• Updated major dependencies (ESLint, Jest, TypeScript ESLint plugins) and Babel plugins to newer versions
• Migrated ESLint configuration from legacy .eslintrc.js to new flat config format in eslint.config.js
• Added ESLint disable comments to suppress TypeScript warnings for intentionally unused variables and any types

Reviewed Changes

Copilot reviewed 13 out of 14 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
package.json	Updated dependency versions for ESLint, Jest, TypeScript tooling, and Babel plugins
eslint.config.js	New ESLint flat configuration file replacing legacy format
.eslintrc.js	Removed legacy ESLint configuration file
.babelrc	Updated Babel plugin names from proposal to transform variants
Multiple TypeScript files	Added ESLint disable comments for unused variables and any types

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[Copilot]

Missing semicolon at the end of the return statement. This change removes the semicolon that was present in the original code.

Suggested change

	return store.fetcher._fetch(nodeToStringHere, { method: "DELETE" })
	return store.fetcher._fetch(nodeToStringHere, { method: "DELETE" });